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Commit 9fa6612f authored by Umang Agrawal's avatar Umang Agrawal Committed by Veerabhadrarao Badiganti
Browse files

mmc: mmc-debugfs: add error statistics 



This change adds support to allow user-space to query the number of
occurrence of the different type of errors that low-level mmc driver
has encountered. These stats can be read/cleared via debugfs.

Change-Id: I7625ff5145c542e05d2d3515a213512a5273e39c
Signed-off-by: default avatarUmang Agrawal <uagrawal@codeaurora.org>
Signed-off-by: default avatarVeerabhadrarao Badiganti <vbadigan@codeaurora.org>
parent cc8c86a2

drivers/mmc/core/debugfs.c

+77 −0
Original line number Diff line number Diff line
@@ -381,6 +381,79 @@ static int mmc_err_state_clear(void *data, u64 val) 
DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get,

		mmc_err_state_clear, "%llu\n");



static int mmc_err_stats_show(struct seq_file *file, void *data)

{

	struct mmc_host *host = (struct mmc_host *)file->private;



	if (!host)

		return -EINVAL;



	seq_printf(file, "# Command Timeout Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_CMD_TIMEOUT]);



	seq_printf(file, "# Command CRC Errors Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_CMD_CRC]);



	seq_printf(file, "# Data Timeout Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_DAT_TIMEOUT]);



	seq_printf(file, "# Data CRC Errors Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_DAT_CRC]);



	seq_printf(file, "# Auto-Cmd Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_ADMA]);



	seq_printf(file, "# ADMA Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_ADMA]);



	seq_printf(file, "# Tuning Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_TUNING]);



	seq_printf(file, "# CMDQ RED Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_RED]);



	seq_printf(file, "# CMDQ GCE Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_GCE]);



	seq_printf(file, "# CMDQ ICCE Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_ICCE]);



	seq_printf(file, "# Request Timedout:\t %d\n",

		   host->err_stats[MMC_ERR_REQ_TIMEOUT]);



	seq_printf(file, "# CMDQ Request Timedout:\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_REQ_TIMEOUT]);



	seq_printf(file, "# ICE Config Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_ICE_CFG]);

	return 0;

}



static int mmc_err_stats_open(struct inode *inode, struct file *file)

{

	return single_open(file, mmc_err_stats_show, inode->i_private);

}



static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,

				   size_t cnt, loff_t *ppos)

{

	struct mmc_host *host = filp->f_mapping->host->i_private;



	if (!host)

		return -EINVAL;



	pr_debug("%s: Resetting MMC error statistics", __func__);

	memset(host->err_stats, 0, sizeof(host->err_stats));



	return cnt;

}



static const struct file_operations mmc_err_stats_fops = {

	.open	= mmc_err_stats_open,

	.read	= seq_read,

	.write	= mmc_err_stats_write,

};



void mmc_add_host_debugfs(struct mmc_host *host)

{

	struct dentry *root;
@@ -430,6 +503,10 @@ void mmc_add_host_debugfs(struct mmc_host *host) 
		&mmc_err_state))

		goto err_node;



	if (!debugfs_create_file("err_stats", 0600, root, host,

		&mmc_err_stats_fops))

		goto err_node;



#ifdef CONFIG_MMC_CLKGATE

	if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),

				root, &host->clk_delay))

include/linux/mmc/host.h

+18 −0
Original line number Diff line number Diff line
@@ -96,6 +96,23 @@ enum mmc_load { 
	MMC_LOAD_LOW,

};



enum {

	MMC_ERR_CMD_TIMEOUT,

	MMC_ERR_CMD_CRC,

	MMC_ERR_DAT_TIMEOUT,

	MMC_ERR_DAT_CRC,

	MMC_ERR_AUTO_CMD,

	MMC_ERR_ADMA,

	MMC_ERR_TUNING,

	MMC_ERR_CMDQ_RED,

	MMC_ERR_CMDQ_GCE,

	MMC_ERR_CMDQ_ICCE,

	MMC_ERR_REQ_TIMEOUT,

	MMC_ERR_CMDQ_REQ_TIMEOUT,

	MMC_ERR_ICE_CFG,

	MMC_ERR_MAX,

};



struct mmc_cmdq_host_ops {

	int (*init)(struct mmc_host *host);

	int (*enable)(struct mmc_host *host);
@@ -563,6 +580,7 @@ struct mmc_host { 
	struct dentry		*debugfs_root;



	bool			err_occurred;

	u32			err_stats[MMC_ERR_MAX];



	struct mmc_async_req	*areq;		/* active async req */

	struct mmc_context_info	context_info;	/* async synchronization info */